In addition to Peter Croft and Josh Shwartz, Jason Lakey also made a complete traverse (16 peaks) in one day in May 2006.
Thanks - I've added that to the text. Do you know how long he took and where he started/ended (that is, was it a TH, or a camp near one of the lakes)?
Unfortunately I don't know much else. It was August, not May (I read a 5 as an 8 earlier). All I know is what he wrote in the Leonard summit register, which was "8/06 complete Traverse of Minarets. 16 summits solo in a day, Jason Lakey"
A fellow named Aiden made a traverse on 9/11/08, soloing (presumably) the SE Face of Clyde and traversing from there over.